Particle size effect on strength, failure and shock behavior in Polytetrafluoroethylene-Al-W granular composites

Details Particle size effect on strength, failure and shock behavior in Polytetrafluoroethylene-Al-W granular composites Particle size effect on strength, failure and shock behavior in Polytetrafluoroethylene-Al-W granular composites

2008-06-11

arxiv.org/abs/0806.1775v1

Physics

Condensed Matter

Soft Condensed Matter

35 pages, 13 figures

Scientific paper

10.1063/1.3000631

The variation of metallic particle size and sample porosity significantly alters the dynamic mechanical properties of high density granular composites processed using a cold isostatically pressed mixture of polytetrafluoroethylene (PTFE), aluminum (Al) and tungsten (W) powders. Quasi-static and dynamic experiments are performed with identical constituent mass fractions with variations in the size of the W particles and pressing conditions. The relatively weak polymer matrix allows the strength and fracture modes of this material to be governed by the granular type behavior of agglomerated metal particles. A higher ultimate compressive strength was observed in relatively high porosity samples with small W particles compared to those with coarse W particles in all experiments. Mesoscale granular force chains comprised of the metallic particles explain this unusual phenomenon as observed in a hydrocode simulation of a drop-weight test. Macrocracks forming below the critical failure strain for the matrix and unusual behavior due to a competition between densification and fracture in dynamic tests of porous samples were also observed. Shock loading of this granular composite resulted in higher fraction of total internal energy deposition in the soft PTFE matrix, specifically thermal energy, which can be tailored by the W particle size distribution.

Affiliated with

Also associated with

No associations

Rating

Particle size effect on strength, failure and shock behavior in Polytetrafluoroethylene-Al-W granular composites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Particle size effect on strength, failure and shock behavior in Polytetrafluoroethylene-Al-W granular composites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Particle size effect on strength, failure and shock behavior in Polytetrafluoroethylene-Al-W granular composites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-264597